JP2016211901A - Rotary encoder - Google Patents

Rotary encoder Download PDF

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Publication number
JP2016211901A
JP2016211901A JP2015093779A JP2015093779A JP2016211901A JP 2016211901 A JP2016211901 A JP 2016211901A JP 2015093779 A JP2015093779 A JP 2015093779A JP 2015093779 A JP2015093779 A JP 2015093779A JP 2016211901 A JP2016211901 A JP 2016211901A
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Prior art keywords
light
rotary encoder
emitting element
receiving element
light emitting
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JP2015093779A
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Japanese (ja)
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翼 磯村
Tsubasa Isomura
翼 磯村
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Tamagawa Seiki Co Ltd
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Tamagawa Seiki Co Ltd
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Priority to JP2015093779A priority Critical patent/JP2016211901A/en
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  • Photo Coupler, Interrupter, Optical-To-Optical Conversion Devices (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a rotary encoder that can reduce the amount of an oblique light which passes through a code board and can suppress reduction in accuracy of detecting a rotational angle due to the oblique light.SOLUTION: The rotary encoder includes: a light emitting element 10 emitting light; a code board 11 connected to a rotating body; and a light receiving element 12 detecting light from the light emitting element 10 which has passed through the code board 11. The code board 11 has identical code patterns 110, 111 at the front and back surfaces, and the back surface has a closing part 111a blocking passage of at least a part of an oblique light 10b having passed through an opening part 110b at the front surface.SELECTED DRAWING: Figure 1

Description

本発明は、回転体の回転角度を検出するロータリーエンコーダに関する。   The present invention relates to a rotary encoder that detects a rotation angle of a rotating body.

従来用いられていたこの種のロータリーエンコーダとしては、例えば下記の特許文献１等に示されている構成を挙げることができる。図２は、従来のロータリーエンコーダを示す説明図である。図２に示すように、ロータリーエンコーダには、発光素子２０、符号板２１及び受光素子２２が含まれている。発光素子２０及び受光素子２２は互いに対向して配置されている。符号板２１は、発光素子２０及び受光素子２２の間に配置されており、図示しない回転体に接続されている。   As this type of rotary encoder that has been conventionally used, for example, the configuration shown in the following Patent Document 1 can be exemplified. FIG. 2 is an explanatory view showing a conventional rotary encoder. As shown in FIG. 2, the rotary encoder includes a light emitting element 20, a code plate 21, and a light receiving element 22. The light emitting element 20 and the light receiving element 22 are disposed to face each other. The code plate 21 is disposed between the light emitting element 20 and the light receiving element 22 and is connected to a rotating body (not shown).

符号板２１の表面には閉部２１０ａ及び開部２１０ｂを含む符号パターン２１０が設けられている。閉部２１０ａは発光素子２０からの光の通過を阻止し、発光素子２０からの光は開部２１０ｂのみで符号板２１を透過することができる。受光素子２２は、符号板２１を透過した発光素子２０からの光を検出する。そして、この受光素子２２によって検出された光に基づいて回転体の回転角度が検出される。   On the surface of the code plate 21, a code pattern 210 including a closed portion 210a and an open portion 210b is provided. The closed portion 210a prevents the light from the light emitting element 20 from passing, and the light from the light emitting element 20 can pass through the code plate 21 only by the open portion 210b. The light receiving element 22 detects light from the light emitting element 20 that has passed through the code plate 21. The rotation angle of the rotating body is detected based on the light detected by the light receiving element 22.

特開２０１０−３２２９０号公報JP 2010-32290 A

発光素子２０からの光には、受光素子２２による検出が意図される並行光２０ａだけでなく、受光素子２２による検出が意図されない斜光２０ｂも含まれている。上記のような従来のロータリーエンコーダでは、符号板２１の表面のみに符号パターン２１０が設けられているので、閉部２１０ａに対向し光を検出すべきでない受光素子２２が斜光２０ｂを検出してしまい、回転体の回転角度の検出精度が低下する。   The light from the light emitting element 20 includes not only the parallel light 20a that is intended to be detected by the light receiving element 22, but also oblique light 20b that is not intended to be detected by the light receiving element 22. In the conventional rotary encoder as described above, since the code pattern 210 is provided only on the surface of the code plate 21, the light receiving element 22 that should face the closed portion 210a and should not detect light detects the oblique light 20b. , The detection accuracy of the rotation angle of the rotating body is lowered.

本発明は、上記のような課題を解決するためになされたものであり、その目的は、符号板を透過する斜光の量を少なくでき、斜光による回転角度の検出精度の低下を抑えることができるロータリーエンコーダを提供することである。   The present invention has been made to solve the above-described problems, and the object thereof is to reduce the amount of oblique light transmitted through the code plate, and to suppress a decrease in the detection accuracy of the rotation angle due to oblique light. It is to provide a rotary encoder.

本発明に係るロータリーエンコーダは、光を発する発光素子と、回転体に接続された符号板と、符号板を透過した発光素子からの光を検出する受光素子とを備え、受光素子によって検出された光に基づいて回転体の回転角度が検出されるロータリーエンコーダであって、符号板の表裏両面に同じ符号パターンが設けられている。   A rotary encoder according to the present invention includes a light emitting element that emits light, a code plate connected to a rotating body, and a light receiving element that detects light from the light emitting element that has passed through the code plate, and is detected by the light receiving element. The rotary encoder detects the rotation angle of the rotating body based on light, and the same code pattern is provided on both the front and back surfaces of the code plate.

本発明のロータリーエンコーダによれば、符号板の表裏両面に同じ符号パターンが設けられているので、符号板を透過する斜光の量を少なくでき、斜光による回転角度の検出精度の低下を抑えることができる。   According to the rotary encoder of the present invention, since the same code pattern is provided on both the front and back surfaces of the code plate, the amount of oblique light transmitted through the code plate can be reduced, and the decrease in the detection accuracy of the rotation angle due to the oblique light can be suppressed. it can.

本発明の実施の形態によるロータリーエンコーダを示す説明図である。It is explanatory drawing which shows the rotary encoder by embodiment of this invention. 従来のロータリーエンコーダを示す説明図である。It is explanatory drawing which shows the conventional rotary encoder.

以下、本発明を実施するための形態について、図面を参照して説明する。
図１は、本発明の実施の形態によるロータリーエンコーダを示す説明図である。図１に示すように、ロータリーエンコーダには、発光素子１０、符号板１１及び受光素子１２が含まれている。発光素子１０及び受光素子１２は互いに対向して配置されている。符号板１１は、発光素子１０及び受光素子１２の間に配置されており、図示しない回転体に接続されている。 Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram showing a rotary encoder according to an embodiment of the present invention. As shown in FIG. 1, the rotary encoder includes a light emitting element 10, a code plate 11, and a light receiving element 12. The light emitting element 10 and the light receiving element 12 are disposed to face each other. The code plate 11 is disposed between the light emitting element 10 and the light receiving element 12 and is connected to a rotating body (not shown).

符号板１１は例えばガラス等の透明部材を基材とするものであり、符号板１１の表裏両面には閉部１１０ａ，１１１ａ及び開部１１０ｂ，１１１ｂをそれぞれ含む符号パターン１１０，１１１が設けられている。閉部１１０ａ，１１１ａは、例えばクロム膜等の不透明膜により構成されるものであり、発光素子１０からの光の通過を阻止する。発光素子１０からの光は、開部１１０ｂ，１１１ｂのみで符号板１１を透過することができる。受光素子１２は、符号板１１を透過した発光素子１０からの光を検出する。この受光素子１２によって検出された光に基づいて回転体の回転角度が検出される。   The code plate 11 has a transparent member such as glass as a base material, and code patterns 110 and 111 including closed portions 110a and 111a and open portions 110b and 111b, respectively, are provided on both front and back surfaces of the code plate 11. Yes. The closed portions 110a and 111a are made of an opaque film such as a chromium film, for example, and block the passage of light from the light emitting element 10. Light from the light emitting element 10 can be transmitted through the code plate 11 only by the opening portions 110b and 111b. The light receiving element 12 detects light from the light emitting element 10 that has passed through the code plate 11. Based on the light detected by the light receiving element 12, the rotation angle of the rotating body is detected.

表面の符号パターン１１０と裏面の符号パターン１１１とは互いに同じものである。すなわち、表面側の閉部１１０ａ及び開部１１０ｂと、裏面側の閉部１１１ａ及び開部１１１ｂとは、発光素子１０からの並行光１０ａが進む方向に沿ってそれらを見たときに互いに重なり合うように設けられている。並行光１０ａとは、発光素子１０と受光素子１２との離間方向に沿って進む光であり、受光素子１２による検出が意図されるものである。符号板１１は、並行光１０ａが進む方向に直交するように延在される。   The code pattern 110 on the front surface and the code pattern 111 on the back surface are the same. That is, the front side closed portion 110a and the open portion 110b and the back side closed portion 111a and the open portion 111b overlap each other when viewed along the direction in which the parallel light 10a from the light emitting element 10 travels. Is provided. The parallel light 10 a is light that travels in the direction in which the light emitting element 10 and the light receiving element 12 are separated from each other, and is intended to be detected by the light receiving element 12. The code plate 11 extends so as to be orthogonal to the direction in which the parallel light 10a travels.

発光素子１０からの光には、上述の並行光１０ａだけでなく、斜光１０ｂも含まれている。斜光１０ｂは、発光素子１０と受光素子１２との離間方向に対して斜めに進む光であり、受光素子１２による検出が意図されないものである。図１に示すように、表面側の開部１１０ｂを通過した斜光１０ｂの少なくとも一部は、裏面側の閉部１１１ａによって通過が阻止される。このため、符号板１１を透過して受光素子１２によって検出される斜光１０ｂの量が少なくなる。   The light from the light emitting element 10 includes not only the parallel light 10a described above but also oblique light 10b. The oblique light 10 b is light that travels obliquely with respect to the direction in which the light emitting element 10 and the light receiving element 12 are separated, and is not intended to be detected by the light receiving element 12. As shown in FIG. 1, at least a part of the oblique light 10b that has passed through the open portion 110b on the front surface side is blocked by the closed portion 111a on the back surface side. For this reason, the amount of oblique light 10b that passes through the code plate 11 and is detected by the light receiving element 12 is reduced.

このようなロータリーエンコーダでは、符号板１１の表裏両面に同じ符号パターン１１０，１１１が設けられているので、符号板１１を透過する斜光１０ｂの量を少なくでき、斜光１０ｂによる回転角度の検出精度の低下を抑えることができる。   In such a rotary encoder, since the same code patterns 110 and 111 are provided on both the front and back surfaces of the code plate 11, the amount of the oblique light 10b transmitted through the code plate 11 can be reduced, and the detection accuracy of the rotation angle by the oblique light 10b can be reduced. The decrease can be suppressed.

１０ 発光素子
１１ 符号板
１２ 受光素子
１１０，１１１ 符号パターン DESCRIPTION OF SYMBOLS 10 Light emitting element 11 Code board 12 Light receiving element 110,111 Code pattern

Claims (1)

光を発する発光素子と、
回転体に接続された符号板と、
前記符号板を透過した前記発光素子からの光を検出する受光素子と
を備え、
前記受光素子によって検出された光に基づいて前記回転体の回転角度が検出されるロータリーエンコーダであって、
前記符号板の表裏両面に同じ符号パターンが設けられている
ことを特徴とするロータリーエンコーダ。 A light emitting element that emits light;
A sign plate connected to the rotating body;
A light receiving element that detects light from the light emitting element that has passed through the code plate, and
A rotary encoder that detects a rotation angle of the rotating body based on light detected by the light receiving element;
The rotary encoder is characterized in that the same code pattern is provided on both the front and back surfaces of the code plate.
JP2015093779A 2015-05-01 2015-05-01 Rotary encoder Pending JP2016211901A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2015093779A JP2016211901A (en) 2015-05-01 2015-05-01 Rotary encoder

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Application Number Priority Date Filing Date Title
JP2015093779A JP2016211901A (en) 2015-05-01 2015-05-01 Rotary encoder

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002023130A1 (en) * 2000-09-13 2002-03-21 Mitsubishi Denki Kabushiki Kaisha Optical encoder
JP2007076027A (en) * 2005-09-12 2007-03-29 Seiko Epson Corp Position detector and liquid ejection apparatus equipped with it
US20110210238A1 (en) * 2010-02-26 2011-09-01 Samsung Techwin Co., Ltd. Encoder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002023130A1 (en) * 2000-09-13 2002-03-21 Mitsubishi Denki Kabushiki Kaisha Optical encoder
JP2007076027A (en) * 2005-09-12 2007-03-29 Seiko Epson Corp Position detector and liquid ejection apparatus equipped with it
US20110210238A1 (en) * 2010-02-26 2011-09-01 Samsung Techwin Co., Ltd. Encoder

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